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DID JEALOUSY DRIVE A MILITARY MAN TO MURDER?, ON "PRIMETIME: CRIME," TUESDAY, AUGUST 21

And: Trust Your Instincts - A Woman Catches an Intruder in Her Home

Also: What Went Wrong on a Mysterious Bus Crash in Kentucky

This week "Primetime: Crime" reports the story of three young lovers caught up in a love triangle that ends with the suspicious suicide of a man named David Heinricht. But why would a young man, in love and just beginning his life, suddenly end it all? Cynthia McFadden reports on "Primetime: Crime," TUESDAY, AUGUST 21 (10:00-11:00 p.m., ET) on the ABC Television Network. Please note, this series will now air at 10:00 p.m., ET.

Just after midnight on October 2, 2005, Christina Cleland came home to find her boyfriend, David Heinricht, dead. His body was on a futon, a noose wrapped around his neck. "I turn the light on," Christina tells McFadden, "and that's when I see the ropes. And I, for a whole second, I stood there because my eyes were lying to me and I didn't want to believe it." She found a typewritten suicide note. "Dear Christina," it read, "I don't love you... you need to go back to your husband." But Christina could not believe Heinricht took his own life, and suspicions were immediately raised as to whether it was a suicide or a murder.

Christina was in a complicated love triangle with Heinricht and her estranged husband, Shaun Cleland. Two years earlier, Christina and Shaun had married in Hawaii, where Shaun, a young soldier, was stationed. Soon after they married, Shaun's career in the military became the source of growing tension between the couple and resulted in the two living in different states, their marriage falling apart. After suspecting that Shaun might be cheating on her, Christina began her own relationship with the couple's former neighbor, David Heinricht. Shaun tried to stay in touch with Christina, but she was ready to move on. Shaun, however, was not ready, and he began a battle to win Christina back that culminated in Shaun going AWOL from his base in Hawaii to fly to Cleveland and beg her to come back to him. He arrived the day before Heinricht's death. And when Christina saw the knot around Heinricht's neck, she immediately recognized it. "There's a special knot on the rope that he always used to close his laundry bag so people wouldn't steal his clothes. And I knew when I saw that, that it was him," Christina tells "Primetime." But did Shaun really murder Heinricht? The program unravels the real story behind David's death.

Also: Twenty-four-year-old Nicole Bishop was living alone in a gated community patrolled by security guards, and thought she was safe -- until she started coming home and noticing that things in her apartment weren't quite as she'd left them. Was there an intruder? She decided to turn her intuition into proof by setting up a hidden camera. Although it looked just like an ordinary alarm clock, it recorded some unexpected footage -- a man she didn't know, letting himself into her home, trying on her lingerie and pleasuring himself sexually. The culprit turned out to be 38-year-old Shawn Rogers, who lived nearby. He was a business consultant, married, the father of a toddler, and he had a clean record - until he went to trial, that is. Mary Fulginiti reports on what the clock camera caught and what happened to Rogers.

And: When a Kentucky school bus mysteriously crashes leaving several children severely injured, shattered families demand to know how this could have happened. "Primetime" reports on the terrifying surveillance tape which captures the actual crash, and it will raise even more questions. Who was this bus driver and why were none of the young students wearing seatbelts? David Muir goes behind the scenes and to get the answers.